An experimental investigation of angled sight flame detectors with 850nm photodiode sensor. Development of experimental equipment
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This thesis describes an experimental investigation of applying photodiodes as sensors inside flame detectors exposed to laminar, transient and turbulent gas explosions, and reflecting environment of various degrees. Small-scale and large-scale experiments have been carried out, in a 0.135m^3 apparatus and a 50m^3 vessel, respectively, with vented premixed gas explosions. The experimental approach of small-scale is transferable to that of large- scale experiments. Experiments with mixtures of propane/air and methane/air with different fuel-air ratios were carried out. High-speed cameras recorded the flame front propagations. The time of arrival detected by the flame sensors, in combination with the high-speed videos, made it possible to validate the functionality of the detectors. Three different optical detectors were investigated, two in small-scale and one in large-scale explosions. A total of 99 tests were carried out, 80 in small scale and 19 in large scale. The data and experience acquired through tests and optimization in small-scale experiments were used to develop flame detectors for the large-scale experiments. The developed detectors were tested and optimized in a 50m^3 test vessel.